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Please use this identifier to cite or link to this item: https://olympias.lib.uoi.gr/jspui/handle/123456789/17602
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dc.contributor.authorKarras, G.en
dc.contributor.authorKosmidis, C.en
dc.date.accessioned2015-11-24T18:40:21Z-
dc.date.available2015-11-24T18:40:21Z-
dc.identifier.issn1387-3806-
dc.identifier.urihttps://olympias.lib.uoi.gr/jspui/handle/123456789/17602-
dc.rightsDefault Licence-
dc.subjectch3ien
dc.subjectclusteren
dc.subjectmedien
dc.subjectnegative ionsen
dc.subjectmethyl-iodide clustersen
dc.subjectinduced coulomb explosionen
dc.subjectcharged atomic ionsen
dc.subjectx-ray-emissionen
dc.subjectnanosecond laseren
dc.subjectmultiphoton ionizationen
dc.subjectassistant generationen
dc.subjectmultiple-ionizationen
dc.subjectmolecular clustersen
dc.subjectmass-spectrometryen
dc.titleMultielectron dissociative ionization of CH(3)I clusters under moderate intensity ps laser irradiationen
heal.typejournalArticle-
heal.type.enJournal articleen
heal.type.elΆρθρο Περιοδικούel
heal.identifier.primaryDOI 10.1016/j.ijms.2010.01.003-
heal.identifier.secondary<Go to ISI>://000275258700010-
heal.identifier.secondaryhttp://ac.els-cdn.com/S1387380610000084/1-s2.0-S1387380610000084-main.pdf?_tid=5b4c2d21ddfaeadb0dca3738fe8a6c57&acdnat=1334228903_47a11baab42e1496cf239154ac84ee1e-
heal.languageen-
heal.accesscampus-
heal.recordProviderΠανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιώνel
heal.publicationDate2010-
heal.abstractThe interaction of 35ps laser pulses with methyl iodide clusters in the intensity region of 10(12)-3 x 10(13) W/cm(2) is studied at lambda = 266,532 and 1064 nm by means of time-of-flight mass spectrometry. At lambda = 532 and 1064 nm the multielectron dissociative ionization (MEDI) of clusters results in highly charged atomic fragment (up to I(7+)) ion production of high kinetic energy. The explosion of the multiple charged cluster ions is found to be isotropic, while an asymmetric charge distribution prior to their fragmentation is observed. Moreover, negative ion formation is observed. The MEDI of clusters exhibits a dependence on laser polarization and the intensity thresholds for the observation of the fragment ions are determined for linear and circular laser polarization. These intensity thresholds are found to be about three orders of magnitude lower than those reported by experiments with 35 ps laser pulses on CH(3)I monomers. For the observed MEDI of (CH(3)I)(n) clusters a mechanism is proposed. According to this mechanism, the clusters are initially single ionized by multiphoton absorption and an internal electric field is created within the cluster, which distorts the potential barriers. This distortion increases the probability for electron tunneling even at relatively low laser intensities, giving thus rise to the formation of negatively charged moieties within the clusters, which prevent the cluster elongation and facile further the tunneling process. This procedure results in a higher distortion of the internal barriers and an increased ionization of the clusters, which, due to increased repulsive forces, finally fragment leading to multiple charged high kinetic energy fragment ion production. (C) 2010 Elsevier B.V. All rights reserved.en
heal.journalNameInternational Journal of Mass Spectrometryen
heal.journalTypepeer reviewed-
heal.fullTextAvailabilityTRUE-
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